a = 2m/s^2
F = 0,6 kN = 600 N = 600 kgm/s^2
m =?
delta V = 45 m/s
t = 2,5 min60 = 150 s
F1 = ?
- obl. masę samochodu
a= F/m
am = F
m = F/a
m = 600 kgm/s^2/2 m/s^2
m = 300 kg
- obl. siłę F1
F1 = ma
a= delta V/t
F1 = mdelta V/t
F1 = 300 kg * 45 m/s/150 s
F1 = 90 N
zad.2
m = 0,5 kg
F = 2 N
t = 5s
F = ma
a = V/t
F = m V/t
Ft = mv
V = F*t/m
V = 2 N 5 s/0,5 kg
V = 2 m/s
[N] = [kgm/s^2]